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BUSINESS COMBINATION - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Jan. 25, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 61,038 |  |  | $ 24,783 | $ 24,783
Sofdesk |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net tangible assets acquired |  |  | $ 1,441 |  |
Intangible assets |  |  | 9,200 |  |
Deferred tax asset |  |  | 457 |  |
Goodwill |  |  | 24,390 |  |
Net assets acquired |  |  | 35,488 |  |
Sofdesk | Customer relationship |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets |  |  | $ 1,800 |  |
DIN's |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net tangible assets acquired |  | $ 1,281 |  |  |
Intangible assets |  | 11,700 |  |  |
Goodwill |  | 11,804 |  |  |
Net assets acquired |  | 24,785 |  |  |
DIN's | Customer relationship |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets |  | $ 11,700 |  |  |

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